*{padding: 0;margin: 0}
.w-9{
    width: 90%;
}
.course{
    height: 128px;
    margin-top: 40px;
}

.nav_color{
    height: 88px;
    margin: 0 auto;
    margin-top: 40px ;
}
.course_nav{
    height: 44px;
    display: flex;
    justify-content: space-around;
}
.course_nav_left{
    width: 99px;
    min-width: 99px;
    height: 44px;
    background: #d7dadd;
    border: 1px solid #b8bbc4;
}
@media screen and (max-width: 768px){
    .course_nav_right_sm{
        margin-top: -5px !important;
        height: 63px !important;
        border: 0 !important;
    }
    .course_nav_left_sm{
        min-width: 100%;
        text-align: right;
        height: 39px;
        border-bottom: 0 !important;
    }
    .course_nav_sm{
        height: 44px;
        display: block;
    }
    .nav_contcent_sm{
        text-align: left!important;
        padding-left: 20px;
    }
    .tt{
        margin-top: 58px;
    }
    .nav_item_top{
        padding-top:15px ;
    }
    .nav_item_bottom{
        padding-top:15px ;
    }
}
.nav_contcent{
    font:14px "微软雅黑";
    font-weight: bold;
    color: #333333;
    text-align: center;
    line-height: 40px;
}
.nav_contcent_span{
}
.course_nav_right{
    width: 100%;
    height: 44px;
    background: #e6e9ed;
    border: 1px solid #b8bbc4;
}
.nav_item_top{
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 242px;
    margin-top: 5px;
    margin-left: 30px;
 }
.nav_item_bottom{
    display: flex;
    justify-content: space-between;
    width: 330px;
    margin-top: 5px;
    margin-left: 30px;
}
.subitem{
    height: 33px;
    width: 66px;
    border:1px solid #c8ccce;
    list-style-type: none;
    text-align: center;
    line-height: 30px;

}
.aitem{
    color: #545b66;
    font:14px "微软雅黑";
}
.aitem:hover{
    color: #545b66;
    text-decoration: none;
}
.l{
    border-left: none;
}
.r{
    border-right: none;
}
.t{
    border-top: none;
}
.b{
    border-bottom: none;
}

.w_flxed{
    width: 90%;
    display: flex;
    /*justify-content: space-around;*/
    flex-wrap: wrap;
    margin: 0 auto;
    margin-bottom: 100px;
}

@media screen and (max-width: 992px) {
    .con{
        width: 50% !important;
        padding: 0 5px !important;
        padding-bottom: 20px !important;
    }
}

@media screen and (max-width: 768px) {
    .course{
        margin-bottom: 100px !important;
    }

}
.con_img{
    width: 100%;
    height: 100%;
}
.con_img:hover{
    height: 80%;
    transform: scale(1.1);
}
.con{
    width: 20%;
    padding: 0 2px;
    padding-bottom: 70px;
    overflow: hidden;
}
.font_size{
    color: #191919;
    font-size: 13px;
}
.font_size:hover{
    text-decoration: none;
    color:#191919;
}
.price1{
    font-size: 13px;
    font-weight: normal;
    color: #c4c4c4;
    font-family: verdana;
}
.price{
    font-size: 13px;
    font-weight: normal;
    color: #ff6621;
    font-family: verdana;
}
.detail{
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    /*white-space: nowrap;*/
    font-size: 12px;
    font-weight: normal;
    color: rgb(158, 158, 158);
    font-family: 微软雅黑;
}
.goumia{
    padding: 5px 16px;
    background: #d7dadd;
    color: #363942;
    font:14px "微软雅黑"
}
.goumia:hover{
    background: #8d9095;
    color: #363942;
    text-decoration: none;
}